Boots – shoes – and leggings
Patent
1990-06-29
1993-11-09
Chun, Debra A.
Boots, shoes, and leggings
364DIG1, 3642295, 36423951, 3642419, 3642448, 3642841, G06F 1314
Patent
active
052610594
ABSTRACT:
An interface between a host computer and a crossbar switch is provided which employs data buffering using multiple-port RAM devices. The receive and transmit data is clocked into or out of separate serial ports of the RAM, and at the same time a local processor can access the RAM by a random access port, asynchronous to the serial ports, to execute the protocol. The order of storing bursts of data in the multiple-port RAM is defined by a free buffer manager which keeps account of which locations are free. The addresses of these locations are moved to a received list after being used for incoming packets. After the protocol processor has finished with its tasks, these addresses, referred to as burst data descriptors, are moved to a transmit list to await loading of burst data back to the serial registers for clocking out, then when transmitted the descriptors are again entered into the free buffer manager.
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"High-Performance Parallel Interface" Protocol Specification, American National Standard for Information Systems, Nov. 1, '89, pp. 1-30.
Brooks Paul T.
Ellsworth, Jr. Donald B.
Halvorson Martin G.
Hedberg William F.
Lewis Richard E.
Chun Debra A.
Digital Equipment Corporation
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